quahog pearl found 50+ years ago

by Jeff
(Glen Gardner, NJ)

My Dad was an avid clammer/fisherman in the rivers, bays and oceans off NJ. He found a pearl in a quahog clam, 50 to 60 years ago. I still have it. It is pale lavender and white; symmetrical; 10 cm in diameter and dome-shaped. Any idea what it is worth?